The Next Generation

angel:
The daughter of the saviour and the reaper she is incredibly powerful but she never really likes to hurt people being the oldest she has to be a good influence but like her father she has a weakness to puns and pranks somehow she was able to turn the deadly gaster blasters into armour and tame the monstrous reaper bird.

Pheonix:
The son of mettaton and papyrus he has the ego to match his parents loving any sought of attention but he’s incredibly self conscious of his looks and personality being the second oldest he needs to make sure angel stays out of trouble and crystal doesn't break anything but like any kid he can't miss a good laugh but he’s not defenceless he can summon a bone club to deal huge damage.

Crystal:
Being the daughter of the scientist and the royal guard captain she’s a big old nerd she loves reading and anything to do with anime but she still has undyne's hostility and headstrong personality she acts animalistic most of the times walking on all fours and sniffing around but if anybody threatened her family or friends her hands will glow if a blue aura and show a shadow effect of huge claws.